It is actually Howlite.
Natural Howlite Round Bead Strands, Dyed & Heated, Medium TurquoiseSize: about 6mm diameter, hole: 1mm; about 70pcs/strand, 15.55 inch.● This stone is from xinjiang, it is known in the trade as Turquoise because of its blue-green hues(dyed & heated treated), similar to turquoise in appearance. Natural Howlite Round Bead Strands.